Cognomen มรกฏ (Rule 
, มรกฏ 
) , around the globe, is a common surname. The last name มรกฏ is habitual in Australia, where it is quite a rare surname, New Zealand, and Cyprus. Measured by absolute frequency, it is the most numerous in the United States, Philippines, and Australia. Much less frequently, มรกฏ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rule | Australia, Philippines, United States, India, United Kingdom |
| มรกฏ | Thailand |